Look Inside Flathead

I wonder if he blocked off the valves on the open side? I see no exhaust from the exposed valves!
 
I did this on my engine, while I had one head off. Any flathead will run like this, but not well. (Due to massive air leaks etc). I suspect he did something to make it run better as a display piece.

Here's mine:

https://www.youtube.com/watch?v=GDtBGoTiQ90

If you look carefully you can see the ignition sparks jumping - not a great idea.
 
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